Solar photospheric spectrum microvariability - II. Observed relations to magnetic activity and radial-velocity modulation

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Fig. 19.

Relative variations of the measured Na I D₁ and D₂ absorption during the seasons of observation. Bottom: Precipitable water vapor above the Roque de los Muchachos observatory on La Palma. Time is given as Barycentric Julian Date. Spectral data from the noisier period in 2018 are omitted (Fig. A.1).

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